Abstract: An exercise apparatus comprises a main body with a cavity that can be selectively covered with a lid. The main body is angled to increase the range of motion of a user of the apparatus. At least a portion of the lid is selectively housed within the cavity. A smaller scale embodiment of the exercise apparatus can be utilized as a sitting apparatus that corrects posture while a user is in a seated position. A method of exercise comprises a variety of steps which can be performed by a user while the user remains on his or her back.